Microsoft has recently announced the ability to connect Skype with Skype for Business (Lync) users.
Communicate with Skype Users with Microsoft Skype for Business
Users will be able to use instant messaging, audio calls, and presence information to communicate with Skype users while using Microsoft Skype for Business (and vice-versa). As of November 2014, Microsoft announced that the “Lync” application would be named “Skype for Business” instead. The name change will be formally applied in early 2015.